ASL is unique to the U.S. Deaf people in other parts of the world have developed their own sign languages. The establishment of the first school for the Deaf in the U.S. in 1817 led to the standardization of ASL. Students who learned the particular form of ASL taught at the school spread it to other parts of the U.S. and Canada. One generation learned from the previous one. ASL is now the language of choice of one-half million Deaf people in the U.S. and Canada. The largest per capita Deaf population in the world lives in the greater Rochester area. There is more of a chance to use ASL here in this community than anywhere else in the world.